One of our readers reported that all the file extensions have changed to some unknown file format. If so, it could be a virus! If a virus has changed all the files extensions to unknown applications, ...

Microsoft uses file associations to set default programs for opening different file types on all its operating systems. As a result, when you open a file, be it text, image, or document, on your ...

What steps do I need to take to change the default action on Windows XP and Windows 7 when someone tries to open a CHM file? I want the file extension to be associated with notepad.exe for ALL users.

First, open Windows Settings by pressing Windows+1 on the keyboard. You can also rick-click the Start button and choose Settings from the menu. In Settings, select "Apps" in the sidebar and choose ...

A file extension is a suffix that is added to the end of a file name after a dot. It is usually two to four letters long. File extensions help Windows and other operating systems to know the standard ...

The type of file format that the current data will be saved to if no other file type is selected. For example, in a graphics program, the default file might be a JPEG or GIF. In Microsoft Word, the ...